King Engine Bearings MB5428SI0.75 Main Bearing Set Honda Oversize - R18A1 0.75mm

The King Engine Bearings MB5428SI0.75 is a complete main bearing set engineered for the Honda R18A1 1.8L four-cylinder engine. This is a 0.75mm oversize bearing set, designed for use during engine rebuilds where the crankshaft main journals have been reground to accommodate increased clearance or to correct worn journal surfaces.

King Engine Bearings are manufactured to exacting OEM tolerances and are a trusted choice among professional engine builders worldwide. These bearings feature King's advanced tri-metal construction, combining a steel backing, copper-lead or aluminum alloy intermediate layer, and a precision-finished overlay for superior wear resistance, load capacity, and conformability.

Key Features:

• 0.75mm oversize main bearing set for undersize/reground crankshafts
• Tri-metal construction for excellent durability and load capacity
• Precision manufactured to tight OEM tolerances for proper oil clearance
• High-performance silicon-aluminum (SI) alloy overlay for improved wear resistance and corrosion protection
• Full set includes all main bearings required for the R18A1 engine
• Designed for professional engine rebuilds and high-performance applications
• Manufactured by King Engine Bearings, a global leader in precision engine bearings

The SI (silicon-aluminum) alloy designation indicates these bearings use King's advanced silicon-aluminum bearing material, which offers superior fatigue strength and seizure resistance compared to standard babbitt overlays — making them well-suited for both stock rebuilds and mildly performance-oriented Honda R18A1 applications.